feat(app): 完善播放协议搜索与空状态

test/support/widget_player.dart

@@ -1,10 +1,9 @@
 // Author: fruit.com.cn
+
 import 'package:fruitshorts/core/data/models/drama.dart';
 import 'package:fruitshorts/core/data/models/player_port.dart';
 
-// Widget tests exercise navigation and scheduling without a native decoder.
-PlayerPort createWidgetPlayer(Episode episode) => WidgetPlayer();
-
+/// 组件测试用播放器，不创建原生解码器。
 class WidgetPlayer implements PlayerPort {
   @override
   Future<void> initialize() async {}
@@ -18,3 +17,6 @@ class WidgetPlayer implements PlayerPort {
   @override
   Future<void> dispose() async {}
 }
+
+/// 组件测试的播放器工厂。
+PlayerPort createWidgetPlayer(Episode episode) => WidgetPlayer();